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【单选题】
女性，70岁，因发热、咳嗽2d拟肺炎入院。有高血压病史多年。入院后给予卧床、吸氧，抗生素和对症处理2天，体温未降，今天输液过程中突然出现烦躁、呼吸困难。查体：体温38.8℃，呼吸46/分钟，血压150/90mmHg，心率124/分钟，口唇发绀，两肺湿啰音。ARDS患者机械通气治疗中，最关键的是（）
A.
控制氧流量低于60%
B.
使用合理PEEP（≥10cmH 2 O）
C.
保证控制通气模式
D.
延长呼气时间（I：E≥1：2.0）
E.
以上都是
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